﻿/*
 * Licensed to the SkyAPM under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The SkyAPM licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

using System;
using System.Threading;
using System.Threading.Tasks;

namespace SkyApm.Agent.AspNet
{
    internal static class AsyncContext
    {
        public static void Run(Func<Task> task)
        {
            using (new ContextScope())
            {
                Task.Run(async () => await task()).GetAwaiter().GetResult();
            }
        }

        private class ContextScope : IDisposable
        {
            private readonly SynchronizationContext _current;

            public ContextScope()
            {
                _current = SynchronizationContext.Current;
                SynchronizationContext.SetSynchronizationContext(null);
            }

            public void Dispose()
            {
                SynchronizationContext.SetSynchronizationContext(_current);
            }
        }
    }
}
